1 /* io.c - ber general i/o routines */
3 * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
4 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
7 * Copyright (c) 1990 Regents of the University of Michigan.
10 * Redistribution and use in source and binary forms are permitted
11 * provided that this notice is preserved and that due credit is given
12 * to the University of Michigan at Ann Arbor. The name of the University
13 * may not be used to endorse or promote products derived from this
14 * software without specific prior written permission. This software
15 * is provided ``as is'' without express or implied warranty.
25 #include <ac/socket.h>
26 #include <ac/string.h>
27 #include <ac/unistd.h>
41 static long BerRead LDAP_P(( Sockbuf *sb, char *buf, long len ));
42 static int ber_realloc LDAP_P(( BerElement *ber, unsigned long len ));
46 /* probably far too large... */
47 #define MAX_BERBUFSIZE (128*1024)
49 #if defined( DOS ) && !defined( _WIN32 ) && (MAX_BERBUFSIZE > 65535)
50 # undef MAX_BERBUFSIZE
51 # define MAX_BERBUFSIZE 65535
55 BerRead( Sockbuf *sb, char *buf, long len )
61 if ( (c = lber_pvt_sb_read( sb, buf, len )) <= 0 ) {
75 ber_read( BerElement *ber, char *buf, unsigned long len )
77 unsigned long actuallen, nleft;
79 nleft = ber->ber_end - ber->ber_ptr;
80 actuallen = nleft < len ? nleft : len;
82 SAFEMEMCPY( buf, ber->ber_ptr, (size_t)actuallen );
84 ber->ber_ptr += actuallen;
86 return( (long)actuallen );
90 ber_write( BerElement *ber, char *buf, unsigned long len, int nosos )
92 if ( nosos || ber->ber_sos == NULL ) {
93 if ( ber->ber_ptr + len > ber->ber_end ) {
94 if ( ber_realloc( ber, len ) != 0 )
97 SAFEMEMCPY( ber->ber_ptr, buf, (size_t)len );
101 if ( ber->ber_sos->sos_ptr + len > ber->ber_end ) {
102 if ( ber_realloc( ber, len ) != 0 )
105 SAFEMEMCPY( ber->ber_sos->sos_ptr, buf, (size_t)len );
106 ber->ber_sos->sos_ptr += len;
107 ber->ber_sos->sos_clen += len;
113 ber_realloc( BerElement *ber, unsigned long len )
115 unsigned long need, have, total;
120 have = (ber->ber_end - ber->ber_buf) / EXBUFSIZ;
121 need = (len < EXBUFSIZ ? 1 : (len + (EXBUFSIZ - 1)) / EXBUFSIZ);
122 total = have * EXBUFSIZ + need * EXBUFSIZ;
124 oldbuf = ber->ber_buf;
126 if ( ber->ber_buf == NULL ) {
127 if ( (ber->ber_buf = (char *) malloc( (size_t)total )) == NULL )
129 } else if ( (ber->ber_buf = (char *) realloc( ber->ber_buf,
130 (size_t)total )) == NULL )
133 ber->ber_end = ber->ber_buf + total;
136 * If the stinking thing was moved, we need to go through and
137 * reset all the sos and ber pointers. Offsets would've been
138 * a better idea... oh well.
141 if ( ber->ber_buf != oldbuf ) {
142 ber->ber_ptr = ber->ber_buf + (ber->ber_ptr - oldbuf);
144 for ( s = ber->ber_sos; s != NULLSEQORSET; s = s->sos_next ) {
145 off = s->sos_first - oldbuf;
146 s->sos_first = ber->ber_buf + off;
148 off = s->sos_ptr - oldbuf;
149 s->sos_ptr = ber->ber_buf + off;
157 ber_free( BerElement *ber, int freebuf )
159 if ( freebuf && ber->ber_buf != NULL )
160 free( ber->ber_buf );
162 free( (char *) ber );
166 ber_flush( Sockbuf *sb, BerElement *ber, int freeit )
168 long nwritten, towrite, rc;
170 if ( ber->ber_rwptr == NULL ) {
171 ber->ber_rwptr = ber->ber_buf;
173 towrite = ber->ber_ptr - ber->ber_rwptr;
175 if ( sb->sb_debug ) {
176 lber_log_printf( LDAP_DEBUG_ANY, sb->sb_debug,
177 "ber_flush: %ld bytes to sd %ld%s\n", towrite,
178 (long) sb->sb_sd, ber->ber_rwptr != ber->ber_buf ? " (re-flush)"
180 lber_log_bprint( LDAP_DEBUG_PACKETS, sb->sb_debug,
181 ber->ber_rwptr, towrite );
184 #if !defined(MACOS) && !defined(DOS)
185 if ( sb->sb_options & (LBER_TO_FILE | LBER_TO_FILE_ONLY) ) {
186 rc = write( sb->sb_fd, ber->ber_rwptr, towrite );
187 if ( sb->sb_options & LBER_TO_FILE_ONLY ) {
195 rc = lber_pvt_sb_write( sb, ber->ber_rwptr, towrite );
201 ber->ber_rwptr += rc;
202 } while ( towrite > 0 );
211 ber_alloc_t( int options )
215 if ( (ber = (BerElement *) calloc( 1, sizeof(BerElement) )) == NULLBER )
217 ber->ber_tag = LBER_DEFAULT;
218 ber->ber_options = options;
219 ber->ber_debug = lber_int_debug;
227 return( ber_alloc_t( 0 ) );
233 return( ber_alloc_t( LBER_USE_DER ) );
237 ber_dup( BerElement *ber )
241 if ( (new = ber_alloc()) == NULLBER )
250 /* OLD U-Mich ber_init() */
252 ber_init_w_nullc( BerElement *ber, int options )
254 (void) memset( (char *)ber, '\0', sizeof( BerElement ));
255 ber->ber_tag = LBER_DEFAULT;
256 ber->ber_options = (char) options;
259 /* New C-API ber_init() */
260 /* This function constructs a BerElement containing a copy
261 ** of the data in the bv argument.
264 ber_init( struct berval *bv )
272 ber = ber_alloc_t( 0 );
274 if( ber == NULLBER ) {
275 /* allocation failed */
280 if ( ( (unsigned int) ber_write ( ber, bv->bv_val, bv->bv_len, 0 )) != bv->bv_len ) {
281 /* write failed, so free and return NULL */
286 ber_reset( ber, 1 ); /* reset the pointer to the start of the buffer */
291 /* New C-API ber_flatten routine */
292 /* This routine allocates a struct berval whose contents are a BER
293 ** encoding taken from the ber argument. The bvPtr pointer pointers to
294 ** the returned berval.
298 struct berval **bvPtr)
306 if ( (bv = malloc( sizeof(struct berval))) == NULL ) {
311 /* ber is null, create an empty berval */
316 /* copy the berval */
317 ptrdiff_t len = ber->ber_ptr - ber->ber_buf;
319 if ( (bv->bv_val = (char *) malloc( len + 1 )) == NULL ) {
324 SAFEMEMCPY( bv->bv_val, ber->ber_buf, (size_t)len );
325 bv->bv_val[len] = '\0';
334 ber_reset( BerElement *ber, int was_writing )
337 ber->ber_end = ber->ber_ptr;
338 ber->ber_ptr = ber->ber_buf;
340 ber->ber_ptr = ber->ber_end;
343 ber->ber_rwptr = NULL;
347 /* return the tag - LBER_DEFAULT returned means trouble */
349 get_tag( Sockbuf *sb )
356 if ( lber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
357 return( LBER_DEFAULT );
359 if ( (xbyte & LBER_BIG_TAG_MASK) != LBER_BIG_TAG_MASK )
360 return( (unsigned long) xbyte );
362 tagp = (char *) &tag;
364 for ( i = 1; i < sizeof(long); i++ ) {
365 if ( lber_pvt_sb_read( sb, (char *) &xbyte, 1 ) != 1 )
366 return( LBER_DEFAULT );
370 if ( ! (xbyte & LBER_MORE_TAG_MASK) )
375 if ( i == sizeof(long) )
376 return( LBER_DEFAULT );
378 /* want leading, not trailing 0's */
379 return( tag >> (sizeof(long) - i - 1) );
384 * A rewrite of get_get_next that can safely be called multiple times
385 * for the same packet. It will simply continue were it stopped until
386 * a full packet is read.
390 ber_get_next( Sockbuf *sb, unsigned long *len, BerElement *ber )
392 if ( ber->ber_debug ) {
393 lber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
398 * Any ber element looks like this: tag length contents.
399 * Assuming everything's ok, we return the tag byte (we
400 * can assume a single byte), return the length in len,
401 * and the rest of the undecoded element in buf.
404 * 1) small tags (less than 128)
405 * 2) definite lengths
406 * 3) primitive encodings used whenever possible
409 if (ber->ber_rwptr == NULL) {
410 assert( ber->ber_buf == NULL );
411 ber->ber_rwptr = (char *) &ber->ber_tag;
415 #define PTR_IN_VAR( ptr, var )\
416 (((ptr)>=(char *) &(var)) && ((ptr)< (char *) &(var)+sizeof(var)))
418 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_tag)) {
419 if (ber->ber_rwptr == (char *) &ber->ber_tag) {
420 if (lber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
422 if ((ber->ber_rwptr[0] & LBER_BIG_TAG_MASK)
423 != LBER_BIG_TAG_MASK) {
424 ber->ber_tag = ber->ber_rwptr[0];
425 ber->ber_rwptr = (char *) &ber->ber_usertag;
431 /* reading the tag... */
432 if (lber_pvt_sb_read( sb, ber->ber_rwptr, 1)<=0)
434 if (! (ber->ber_rwptr[0] & LBER_MORE_TAG_MASK) ) {
435 ber->ber_tag>>=sizeof(ber->ber_tag) -
436 ((char *) &ber->ber_tag - ber->ber_rwptr);
437 ber->ber_rwptr = (char *) &ber->ber_usertag;
440 } while (PTR_IN_VAR(ber->ber_rwptr,ber->ber_tag));
441 errno = ERANGE; /* this is a serious error. */
445 if (ber->ber_rwptr==(char *) &ber->ber_usertag) {
447 if (lber_pvt_sb_read( sb, (char *) &c, 1)<=0)
451 if ( (len==0) || ( len>sizeof( ber->ber_len ) ) ) {
455 ber->ber_rwptr = (char *) &ber->ber_len +
456 sizeof(ber->ber_len) - len;
463 if (PTR_IN_VAR(ber->ber_rwptr, ber->ber_len)) {
466 to_go = (char *) &ber->ber_len + sizeof( ber->ber_len ) -
469 res = lber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
472 ber->ber_rwptr += res;
474 /* convert length. */
475 ber->ber_len = AC_NTOHL( ber->ber_len );
478 #if defined( EWOULDBLOCK )
480 #elif defined( EAGAIN )
487 /* now fill the buffer. */
488 if (ber->ber_buf==NULL) {
489 if (ber->ber_len > MAX_BERBUFSIZE) {
493 ber->ber_buf = (char *) malloc( ber->ber_len );
494 if (ber->ber_buf==NULL)
496 ber->ber_rwptr = ber->ber_buf;
497 ber->ber_ptr = ber->ber_buf;
498 ber->ber_end = ber->ber_buf + ber->ber_len;
500 if ((ber->ber_rwptr>=ber->ber_buf) && (ber->ber_rwptr<ber->ber_end)) {
504 to_go = ber->ber_end - ber->ber_rwptr;
507 res = lber_pvt_sb_read( sb, ber->ber_rwptr, to_go );
513 #if defined( EWOULDBLOCK )
515 #elif defined( EAGAIN )
521 ber->ber_rwptr = NULL;
523 if ( ber->ber_debug ) {
524 lber_log_printf( LDAP_DEBUG_TRACE, ber->ber_debug,
525 "ber_get_next: tag 0x%lx len %ld contents:\n",
526 ber->ber_tag, ber->ber_len );
527 lber_log_dump( LDAP_DEBUG_BER, ber->ber_debug, ber, 1 );
529 return (ber->ber_tag);
531 assert( 0 ); /* ber structure is messed up ?*/
535 void ber_clear( BerElement *ber, int freebuf )
537 if ((freebuf) && (ber->ber_buf))
538 free( ber->ber_buf );
540 ber->ber_rwptr = NULL;
544 Sockbuf *lber_pvt_sb_alloc( void )
546 Sockbuf *sb = calloc(1, sizeof(Sockbuf));
547 lber_pvt_sb_init( sb );
551 Sockbuf *lber_pvt_sb_alloc_fd( int fd )
553 Sockbuf *sb = lber_pvt_sb_alloc();
554 lber_pvt_sb_set_desc( sb, fd );
555 lber_pvt_sb_set_io( sb, &lber_pvt_sb_io_tcp, NULL );
559 void lber_pvt_sb_free( Sockbuf *sb )
561 if(sb == NULL) return;
562 lber_pvt_sb_destroy( sb );
566 int lber_pvt_sb_get_option( Sockbuf *sb, int opt, void *outvalue )
568 return LBER_OPT_ERROR;
571 int lber_pvt_sb_set_option( Sockbuf *sb, int opt, void *invalue )
573 return LBER_OPT_ERROR;